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Lidia

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Sand Timer Puzzle
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Brain Teaser 56

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Sand Timer Puzzle

Start both the timers together. When 7 minute timer get finished start the countdown of 4 last minutes in 11 minute timer (11 - 7 = 4).

Now wait till 4 minute finishes and reverse 11 minute timer. Once this finishes task is done (4 + 11 = 15).

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